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Question

(A) In the reaction $CH_3-CH=CH_2 \xrightarrow{HBr, H_2O_2} CH_3-CH_2-CH_2Br$,the mechanism involves a free radical intermediate (peroxide effect or K

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$CH_3-CH=CH_2 \xrightarrow{HBr, H_2O_2} CH_3-CH_2-CH_2Br$

Vedclass · Answer

(A) In the reaction $CH_3-CH=CH_2 \xrightarrow{HBr, H_2O_2} CH_3-CH_2-CH_2Br$,the mechanism involves a free radical intermediate (peroxide effect or Kharasch effect),not a carbocation.In $CH_3-CH=CH_2 \xrightarrow{HCl} CH_3-CHCl-CH_3$,the mechanism involves the formation of a secondary carbocation intermediate.In $(CH_3)_3C-OH \xrightarrow{H^+, \Delta} (CH_3)_2C=CH_2 + H_2O$,the dehydration of alcohol involves the formation of a tertiary carbocation intermediate.In $C_6H_6 + CH_3Cl \xrightarrow{AlCl_3} C_6H_5-CH_3 + HCl$,the Friedel-Crafts alkylation involves the formation of an electrophilic carbocation $(CH_3^+)$ intermediate.Therefore,the reaction that does not involve a carbocation is the anti-Markovnikov addition of $HBr$ in the presence of peroxide.

Which of the following reactions does not involve a carbocation as an intermediate?

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